Buried integrated rural domestic sewage treatment device

Abstract

The utility model relates to the field of rural domestic sewage, and discloses a buried integrated rural domestic sewage treatment device for improving the rural domestic sewage treatment effect. Comprising a first cell, a second cell, a third cell and a fourth cell which are communicated in sequence; a first water inlet is formed in the side wall of the first grid chamber, and the effective volume of the first grid chamber is below the first water inlet; a stirring device is arranged in the second grid chamber; a packed bed is arranged in the third cell; the packed bed is communicated with a water inlet of the third cell; a vertical filter screen is arranged in the middle of a bottom plate of the fourth grid chamber, and the height of the vertical filter screen is lower than the height of the effective volume of the fourth grid chamber; and a water outlet is formed in the fourth grid chamber. The device disclosed by the utility model can obviously improve the effluent quality and reduce the burden of subsequent treatment.

Description

Technical Field

[0001] The present invention relates to the field of rural domestic sewage treatment, and in particular to an underground integrated rural domestic sewage treatment device for improving the rural domestic sewage treatment effect. Background Art

[0002] The description of the background technology in the present utility model belongs to the related technology related to the present utility model, which is only used to illustrate and facilitate the understanding of the content of the present utility model, and should not be understood as the applicant explicitly believes or presumed that the applicant believes that it is the prior art of the present utility model on the filing date of the first application.

[0003] In recent years, three-compartment septic tanks have been promoted as the main toilet type in most areas due to their easy operation, good harmless effect and high fertilizer efficiency. Especially in rural areas, due to the imperfection of sewage pipes and sewage treatment facilities, septic tanks have become an indispensable facility for residential buildings.

[0004] Black water contains a large amount of nitrogen and phosphorus nutrients and has great potential for resource utilization. However, the traditional three-compartment septic tank has limited ability to remove organic matter from black water. According to literature reports and actual surveys, the concentration of organic matter in the effluent of the septic tank is difficult to reach the emission limit of the "Agricultural Irrigation Water Quality Standard" (GB5084). Excessive concentration of organic matter may damage the structure and properties of the soil, and further may directly lead to the stunted growth or death of crops. Therefore, it is of great practical significance to optimize the design of traditional septic tanks, improve their effluent quality and reuse them for agricultural irrigation or reduce the burden on subsequent treatment systems. Utility Model Content

[0005] The purpose of the embodiment of the utility model is to provide an underground integrated rural domestic sewage treatment device which is easy to transform, low in cost, and can effectively improve the rural domestic sewage treatment effect, so as to solve the problems existing in the above-mentioned prior art.

[0006] A buried integrated rural domestic sewage treatment device comprises a first cell, a second cell, a third cell and a fourth cell which are connected in sequence; a first water inlet is arranged on the side wall of the first cell, and the effective volume of the first cell is below the first water inlet; a stirring device is arranged in the second cell; a packing bed is arranged in the third cell; the packing bed is connected with the water inlet of the third cell; a vertical filter is arranged in the middle of the bottom plate of the fourth cell, and the height of the vertical filter is lower than the height of the effective volume of the fourth cell; a water outlet is arranged on the fourth cell.

[0007] Furthermore, a guide baffle inclined downward from the first water inlet to the middle of the first cell is provided below the first water inlet; a prismatic guide platform is provided in the middle of the bottom plate of the first cell, and an overflow channel is formed between the guide plate and the prismatic guide platform; the first cell is connected to the second cell through the second water inlet, and a filter screen extending toward the center of the first cell is provided on the side wall of the first cell below the second water inlet; a slag cleaning port is provided on the top of the first cell.

[0008] Furthermore, the filter is divided into two layers, the upper filter (length*width: 0.6m*1.2m) is longer than the lower filter (length*width: 0.4m*1.2m).

[0009] Furthermore, the stirring device comprises a vertical mixer located above the outside of the second compartment, a stirring rod extending into the inside of the second compartment is connected to the bottom of the vertical mixer, and the stirring rod is provided with a three-blade propulsion blade.

[0010] Furthermore, an aeration plate is provided in the third cell, and the aeration plate is located below the packing bed; the aeration plate is connected to an air pump located outside the third cell through an aeration pipe; and an exhaust pipe is provided on the top of the third cell.

[0011] Furthermore, the aeration pipe includes an aeration main pipe, which is connected to the air pump; the aeration main pipe is provided with a plurality of aeration branches, which are located below the packing bed, and each aeration branch pipe is provided with an aeration plate.

[0012] Furthermore, the underground integrated rural domestic sewage treatment device also includes a solar power generation device, and the solar power generation device is electrically connected to the vertical mixer and the air pump respectively.

[0013] Furthermore, the packing bed is a columnar packing bed, which includes a water inlet cavity at a central position, a multi-layer packing tray is provided between the water inlet cavity and an inner wall of the columnar packing bed, and packing is provided on the packing tray.

[0014] By means of the above scheme, the utility model has at least the following beneficial effects:

[0015] A guide baffle is set in the first cell, and two layers of filter screens with different pore sizes are set, so that the sewage is fully precipitated and filtered; a mixer is set in the second cell; a cylindrical packing bed is set in the third cell, and the sewage enters the middle cavity of the cylindrical packing bed along the third water inlet pipe, and after sufficient contact with the filler, it flows out along the outer wall of the packing bed, and an aeration device is set to provide the required oxygen for the biochemical reaction; a filter screen is set in the fourth cell, so that the sewage is precipitated and filtered again, and the effluent water quality is improved. The cylindrical packing bed in the third cell of the present invention, the filler increases the microbial attachment area, and at the same time plays a filtering effect, thereby improving the microbial biochemical reaction rate, can effectively improve the degradation ability of microorganisms and the removal efficiency of pollutants, so that the effluent meets the "Farmland Irrigation Water Quality Standard" (GB5084-2021), and provides a guarantee for the subsequent resource utilization of rural domestic sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the utility model, the following is a brief introduction to the drawings required for describing the embodiments:

[0017] Figure 1 This is a schematic diagram of the structure of an underground integrated device proposed by the present invention;

[0018] Among them: 1. First water inlet; 2. Prismatic guide platform; 3. Slag removal port; 4. Effective volume line; 5. Rotation limiter; 6. Guide baffle; 7. Guide baffle hole; 8. Filter; 9. Second water inlet; 10. Vertical mixer; 11. Three-blade propulsion blade; 12. Third water inlet; 13. Columnar packing bed; 14. Columnar packing bed load-bearing column; 15. Aeration plate; 16. Aeration pipe; 17. Air pump; 18. Exhaust pipe; 19. Fourth water inlet; 20. Vertical filter; 21. Water outlet; 22. Battery; 23. Solar panel; 24. Ground plane;

[0019] Figure 2 It is a schematic diagram of the structure of the cylindrical packed bed in the present invention;

[0020] Among them: 25, water inlet cavity; 26, packing tray; 27, cylindrical packing bed base buckle; 28, packing;

[0021] Figure 3 It is a schematic structural diagram of a load-bearing column of a cylindrical packed bed in the present invention;

[0022] Among them: 29, cylindrical packing bed base slot. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the embodiments are intended to make it easier for those skilled in the art to understand the technical solution of the present invention, and cannot be used as a limitation on the protection scope of the present invention.

[0024] In the following introduction, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The following introduction provides multiple embodiments of the utility model, and different embodiments can be replaced or combined, so the utility model can also be considered to include all possible combinations of the same and / or different embodiments recorded. Therefore, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then the utility model should also be considered to include embodiments containing one or more of all other possible combinations of A, B, C, and D, even though the embodiment may not be clearly recorded in the following text.

[0025] A buried integrated rural domestic sewage treatment device comprises a first cell, a second cell, a third cell and a fourth cell which are connected in sequence; a first water inlet is arranged on the side wall of the first cell, and the effective volume of the first cell is below the first water inlet; a stirring device is arranged in the second cell; a packing bed is arranged in the third cell; the packing bed is connected with the water inlet of the third cell; a vertical filter is arranged in the middle of the bottom plate of the fourth cell, and the height of the vertical filter is lower than the height of the effective volume of the fourth cell; a water outlet is arranged on the fourth cell.

[0026] The first cell is an anaerobic fermentation cell, the second cell is a stirring cell, the third cell is a biological treatment cell, and the fourth cell is a secondary sedimentation cell.

[0027] A first water inlet is arranged above the left side of the first cell; a guide baffle is arranged below the first water inlet, and the guide baffle is installed on the rotation limiter of the wall of the first cell, and the angle between the guide baffle and the pool wall is set to be 30°; a prismatic guide platform is arranged at the bottom of the first cell, and the guide partition and the prismatic guide platform form an overflow channel; a hole is opened at the center of the lower end of the guide baffle, and the circular hole can be inserted into a lifting tool; the guide baffle can rotate with the lifting tool; two layers of filter screens with different pore sizes are arranged along the height direction on the side close to the second cell, and an overflow channel is formed with the prismatic guide platform.

[0028] A second water inlet is provided at the upper end of the uppermost filter screen to connect the first cell with the second cell. A connecting pipe at the second water inlet is directly connected to the middle of the second cell. A vertical mixer is provided in the second cell. The vertical mixer is equipped with double-layer propulsion blades.

[0029] A third water inlet is provided at the upper end of the second partition plate to connect the second cell and the third cell, an exhaust pipe is provided at the top of the third cell, a columnar packing bed is provided in the third cell, the water inlet pipe of the third water inlet directly extends to the water inlet cavity of the columnar packing bed, the columnar packing bed is provided with a three-layer packing tray, packing is placed on the packing tray, a layer of cover net is installed on the outside of the packing bed, a load-bearing column is provided at the bottom of the third cell, a card slot is provided at the top of the load-bearing column, and the base of the columnar packing bed is buckled and fixed to the card slot at the top of the load-bearing column. An aeration device is installed in the third cell, the aeration device includes an air pump, an aeration plate and an aeration pipe, wherein a plurality of aeration plates are provided on the aeration branch pipe, and the aeration main pipe is connected to the air pump from the bottom to the top along the wall of the third cell.

[0030] A fourth water inlet connecting the third cell and the fourth cell is arranged at the upper end of the third partition plate, a filter screen inserted vertically downward is arranged in the middle of the lower end of the fourth cell, and a water outlet is arranged at the other side of the fourth cell.

[0031] like Figure 1 As shown, an underground integrated device for rural domestic sewage treatment includes a sewage treatment device and a solar device. A plurality of partitions are arranged inside the integrated device to divide the sewage treatment device into a plurality of cells, including a first cell, a second cell, a third cell and a fourth cell from left to right.

[0032] The first cell has the largest volume and is an anaerobic environment. It has a built-in guide plate 6 and a prismatic guide platform 2 with adjustable angles. An overflow channel is formed between the guide plate 6 and the prismatic guide platform 2. Under the action of gravity, large particles in domestic sewage are gradually separated into three layers: a scum layer, an intermediate layer, and a sediment layer. At the same time, organic matter is partially degraded through anaerobic fermentation, thereby achieving preliminary treatment of sewage. Two layers of filter screens 8 with gradually decreasing pores from bottom to top are arranged below the second water inlet pipe 9 on the right wall of the first cell (the aperture size of the small holes on the upper filter screen is 20 mm, the aperture size of the large holes on the lower filter screen is 30 mm, the filter screen thickness is 5-10 mm, and the spacing between the filter screens is 200 mm), so that sediment and scum materials are trapped in the first cell, effectively reducing the large particles such as eggs and pathogens entering the second water inlet.

[0033] Then the sewage enters the bottom of the second cell through the second water inlet 9 connecting pipe, and a vertical mixer 10 equipped with a double-layer propeller blade 11 is arranged in the second cell, and the vertical mixer 10 rotates at 40-136rpm. Under the rotation of the vertical mixer 10, the mixing blades 11 mix the mixture of feces and water evenly, so that the feces are separated from the water more quickly and fully, thereby promoting the precipitation, avoiding the subsequent packing bed from being blocked, and fully mixing the nutrients and microorganisms in the sewage, improving the treatment effect, promoting the fermentation metabolism of anaerobic bacteria, and increasing the biochemical reaction rate.

[0034] The front end of the third water inlet pipe 12 is inserted into the middle of the second cell, so that the sewage after full centrifugation in the second cell flows into the water inlet cavity 25 of the cylindrical packing bed 13 of the third cell through the connecting pipe. The cylindrical packing bed 13 is provided with a three-layer packing tray 26 and a cover net to provide support and restraint for the packing 28, so that it is not affected by hydraulic scouring and buoyancy. The sewage seeps out from the cavity 25 through the packing 28 from the inside to the outside, and the microorganisms attach and grow on the packing 28 (the filler uses clay ceramsite with a particle size of 5-8mm), so that the contact area between the sewage and the microorganisms is increased, the reaction efficiency is improved, and the organic matter is intercepted (filtered), adsorbed and decomposed by the microorganisms. A load-bearing column 14 is provided at the bottom of the third cell, and a slot 30 is provided at the top of the load-bearing column 14. The base buckle 27 of the cylindrical packing bed is fixed to the slot 29 at the top of the load-bearing column. The third cell is equipped with an exhaust pipe 18 and an aeration device, which includes an air pump 17, an aeration plate 15 and an aeration pipe 16, wherein a plurality of aeration plates 15 are arranged on the aeration branch pipe, and the aeration main pipe is connected to the air pump 17 along the wall of the third cell from bottom to top, so that the sewage in the third cell is fully in contact with the air, increasing the oxygen content in the water, so that the microorganisms in the sewage can oxidize and decompose the organic matter under the condition of sufficient dissolved oxygen.

[0035] The sewage extends to the middle of the fourth cell along the fourth water inlet pipe 19, and a vertically inserted filter screen 20 is set in the middle of the lower end of the fourth cell to intercept and filter the larger particles in the sewage again to ensure the quality of the effluent. An outlet 22 is set on the other side of the fourth cell, and the treated sewage is discharged from the outlet 22.

[0036] Furthermore, the present invention is also equipped with a solar power generation device 24, which provides power for the vertical mixer 10 in the second cell and the aeration device in the third cell. Furthermore, the effective volume of the first cell is greater than the effective volume of the second cell; the effective volume of the first cell is greater than the effective volume of the third cell.

[0037] Furthermore, the first chamber accounts for 30% of the total volume of the sewage treatment device, the second chamber accounts for 20% of the total volume of the sewage treatment device, the third chamber accounts for 20% of the total volume of the sewage treatment device, and the fourth chamber accounts for 30% of the total volume of the sewage treatment device.

[0038] Example 1

[0039] The device of the present invention is used to treat rural domestic sewage in a certain area of ​​Shanxi Province. The water volume is 60L / d, and the hydraulic retention time of the sewage in the first chamber of the integrated device is 20 days. The rural domestic sewage enters the device for treatment. The effective volume of the integrated device is 4.8m 3; The volume of the first cell is 1.2×1.0×1.2 (length, width and height, unit: m), the volume of the second cell is 0.8×1.0×1.2 (length, width and height, unit: m), the volume of the third cell is 0.8×1.0×1.2 (length, width and height, unit: m), and the volume of the fourth cell is 1.2×1.0×1.2 (length, width and height, unit: m).

[0040] The impeller diameter of the vertical mixer in the second compartment of the integrated device is 300mm, and the speed is 130rpm. The diameter of the aeration disk of the aeration device in the third compartment is 215mm, the average pore size of the aeration membrane is 80-100μm, the main pipe flow rate is 10-15m / s, and the branch pipe flow rate is 5m / s.

[0041] According to the running speed and running time of the vertical mixer, the running air volume of the aeration device and the design flow rate of the air pipe, the power that the solar panel can provide must be above 5kw. The water quality data after treatment are shown in Table 1 and Table 2.

[0042] Table 1 is a comparison of the water output from the second compartment of the vertical mixer when it is started and when it is not started.

[0043]

[0044] Table 2 shows the effluent quality of the four cells using the process of the present invention.

[0045]

[0046] When the COD raw water was 803.6 mg / L, the removal rates of COD, total nitrogen and total phosphorus were also improved when the vertical mixer was started. The COD removal rate increased by 33.4%; the total phosphorus removal rate increased by 11.2%; and the total nitrogen removal rate increased by 10.8%.

[0047] Under normal operation of the device: its COD removal rate reached 90.0%, total nitrogen removal rate reached 56.7%, and total phosphorus removal rate reached 52.9%. The COD, total nitrogen and total phosphorus removal rates of the traditional three-chamber septic tank were only 48.5%, 6.8% and 24.2% respectively. And with the improvement of ammonia nitrogen removal rate, the nitrate nitrogen content increased, indicating that the nitrogen in the sewage was gradually converted from ammonia nitrogen to nitrate nitrogen, adjusting the proportion of nitrogen forms in the sewage, providing favorable conditions for subsequent resource utilization and promoting crop growth.

[0048] As a rural domestic sewage treatment device, compared with the treatment effect of traditional septic tanks, it significantly improves the effluent quality, reduces the burden of subsequent treatment, makes the effluent meet the "Agricultural Irrigation Water Quality Standards" (GB5084-2021), and also retains nitrogen and phosphorus elements, providing conditions for the subsequent resource utilization of rural domestic sewage.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0050] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An underground integrated rural domestic sewage treatment device, characterized in that: It comprises a first cell, a second cell, a third cell and a fourth cell which are connected in sequence; a first water inlet is arranged on the side wall of the first cell, and the effective volume of the first cell is below the first water inlet; a stirring device is arranged in the second cell; a packing bed is arranged in the third cell; the packing bed is connected with the water inlet of the third cell; a vertical filter is arranged in the middle of the bottom plate of the fourth cell, and the height of the vertical filter is lower than the height of the effective volume of the fourth cell; a water outlet is arranged on the fourth cell.

2. The underground integrated rural domestic sewage treatment device according to claim 1 is characterized in that: A guide baffle is provided below the first water inlet and is inclined downward from the first water inlet to the middle of the first cell; a prismatic guide platform is provided in the middle of the bottom plate of the first cell, and an overflow channel is formed between the guide baffle and the prismatic guide platform; the first cell is connected to the second cell through the second water inlet, and a filter screen is provided on the side wall of the first cell below the second water inlet and extends toward the center of the first cell; a slag cleaning port is provided on the top of the first cell.

3. The underground integrated rural domestic sewage treatment device according to claim 2 is characterized in that: The filter screen is divided into two layers, an upper layer and an lower layer, and the length of the upper layer filter screen is greater than that of the lower layer filter screen.

4. The underground integrated rural domestic sewage treatment device according to claim 1 is characterized in that: The stirring device comprises a vertical mixer located above the outside of the second compartment, a stirring rod extending into the inside of the second compartment is connected to the bottom of the vertical mixer, and the stirring rod is provided with a three-leaf propulsion blade.

5. The underground integrated rural domestic sewage treatment device according to claim 4 is characterized in that: The third cell is provided with an aeration plate, which is located below the packing bed; the aeration plate is connected to an air pump located outside the third cell through an aeration pipe; and an exhaust pipe is provided on the top of the third cell.

6. The underground integrated rural domestic sewage treatment device according to claim 5 is characterized in that: The aeration pipe comprises an aeration main pipe, which is connected to the air pump; the aeration main pipe is provided with a plurality of aeration branches, which are located below the packing bed, and each aeration branch pipe is provided with an aeration plate.

7. The underground integrated rural domestic sewage treatment device according to claim 6 is characterized in that: The underground integrated rural domestic sewage treatment device also includes a solar power generation device, and the solar power generation device is electrically connected to the vertical mixer and the air pump respectively.

8. The underground integrated rural domestic sewage treatment device according to claim 1 is characterized in that: The packing bed is a columnar packing bed, which includes a water inlet cavity at the center. A multi-layer packing tray is arranged between the water inlet cavity and the inner wall of the columnar packing bed, and packing is arranged on the packing tray.

Images